Uluslararası Bilim, Teknoloji ve Tasarım Dergisi

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    Obtaining sound transmission loss of inner dash insulator via numerical methods
    (Bursa Uludağ Üniversitesi, 2021-12-27) Ceyhan, Mustafa; Doğru, Tunahan; Sevim, Halim; Öğütgen, Merve Kafiye; Aydın, İbrahim
    In-cabin acoustic comfort has an important place in the brand preference of customers today. Automotive main and sub- industry companies plan their research and development investments taking into consideration acoustic comfort. The airborne and structure-borne noise of the engine is reduced by the inner dash insulators and the acoustic comfort in the cabin is improved. As a result of today's changing needs and the ongoing competition between automotive companies, continuous development studies are carried out for insulators. The purpose of this study is to calculate the sound transmission loss of the dashboard insulators in automobiles by numerical means and to evaluate the effect of different materials used on sound transmission loss. For this purpose, to model porous materials used in insulators in finite element acoustic analysis, the parameters of the JCAL Model were obtained by using an impedance tube with a reverse characterization method. Again, the modulus of elasticity and damping ratio of viscoelastic-based materials used in insulators were determined by sound transmission loss measurements and analysis with a reverse engineering approach. With the material parameters obtained, the transmission loss was calculated by performing finite element acoustic analysis of an inner dash insulator. The effect of different material configurations on sound transmission loss was evaluated.